*: optimize heartbeat process with concurrent runner - part 2

[nolouch]

What problem does this PR solve?

Issue Number: Ref #7897

What is changed and how does it work?

Optimize heartbeat process
- Split the statics updates on the subtree

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Before:

After:

The duration of the pending state on tikvs has been reduced from 10 minutes to 3 minutes

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Merging #8052 (3007e31) into master (5cdf252) will increase coverage by 0.05%.
Report is 2 commits behind head on master.
The diff coverage is 97.69%.

❗ Current head 3007e31 differs from pull request most recent head 15b1979. Consider uploading reports for the commit 15b1979 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8052      +/-   ##
==========================================
+ Coverage   77.29%   77.34%   +0.05%     
==========================================
  Files         470      470              
  Lines       61143    61225      +82     
==========================================
+ Hits        47260    47355      +95     
+ Misses      10320    10309      -11     
+ Partials     3563     3561       -2     

Flag	Coverage Δ
unittests	77.34% <97.69%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[nolouch]

PTAL @rleungx @JmPotato @HuSharp

[JmPotato]

Is there a possibility that the following situation exists: I detected an overlap in the leaders tree and added item.RegionInfo, then, before I check other role trees, something like a leader transfer occurs. Will I not be able to get the latest item.RegionInfo because of this? Will there be any side effects?

[nolouch]

Here checks hold the lock, which means the new changes have not updated the subtree yet. So I think it's ok, then will handle the new updates.

[JmPotato]

/merge

[ti-chi-bot]

@JmPotato: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: f67c8a8

[ti-chi-bot]

@nolouch: Your PR was out of date, I have automatically updated it for you.

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